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The coronavirus can stay aloft for hours in tiny droplets in stagnant air, infecting people as they inhale, mounting scientific evidence suggests.

This risk is highest in crowded indoor spaces with poor ventilation, and may help explain superspreading events reported in meatpacking plants, churches and restaurants.

It’s unclear how often the virus is spread via these tiny droplets, or aerosols, compared with larger droplets that are expelled when a sick person coughs or sneezes, or transmitted through contact with contaminated surfaces, said Linsey Marr, an aerosol expert at Virginia Tech.

Follow latest updates on the Covid-19 pandemic here

Aerosols are released even when a person without symptoms exhales, talks or sings, according to Marr and more than 200 other experts, who have outlined the evidence in an open letter to the World Health Organization.

What is clear, they said, is that people should consider minimizing time indoors with people outside their families. Schools, nursing homes and businesses should consider adding powerful new air filters and ultraviolet lights that can kill airborne viruses.

What does it mean for a virus to be airborne?

For a virus to be airborne means that it can be carried through the air in a viable form. For most pathogens, this is a yes-no scenario. HIV, too delicate to survive outside the body, is not airborne. Measles is airborne, and dangerously so: It can survive in the air for up to two hours.

For the coronavirus, the definition has been more complicated. Experts agree that the virus does not travel long distances or remain viable outdoors. But evidence suggests it can traverse the length of a room and, in one set of experimental conditions, remain viable for perhaps three hours.

How are aerosols different from droplets?

Aerosols are droplets, droplets are aerosols — they do not differ except in size. Scientists sometimes refer to droplets fewer than 5 microns in diameter as aerosols. (By comparison, a red blood cell is about 5 microns in diameter; a human hair is about 50 microns wide.)

From the start of the pandemic, the WHO and other public health organizations have focused on the virus’s ability to spread through large droplets that are expelled when a symptomatic person coughs or sneezes.

These droplets are heavy, relatively speaking, and fall quickly to the floor or onto a surface that others might touch. This is why public health agencies have recommended maintaining a distance of at least 6 feet from others, and frequent hand washing.

But some experts have said for months that infected people also are releasing aerosols when they cough and sneeze. More important, they expel aerosols even when they breathe, talk or sing, especially with some exertion.

Scientists know now that people can spread the virus even in the absence of symptoms — without coughing or sneezing — and aerosols might explain that phenomenon.

Because aerosols are smaller, they contain much less virus than droplets do. But because they are lighter, they can linger in the air for hours, especially in the absence of fresh air. In a crowded indoor space, a single infected person can release enough aerosolized virus over time to infect many people, perhaps seeding a superspreader event.

For droplets to be responsible for that kind of spread, a single person would have to be within a few feet of all the other people, or to have contaminated an object that everyone else touched. All that seems unlikely to many experts: “I have to do too many mental gymnastics to explain those other routes of transmission compared to aerosol transmission, which is much simpler,” Marr said.

Can I stop worrying about physical distancing and washing my hands?

Physical distancing is still very important. The closer you are to an infected person, the more aerosols and droplets you may be exposed to. Washing your hands often is still a good idea.

What’s new is that those two things may not be enough. “We should be placing as much emphasis on masks and ventilation as we do with hand washing,” Marr said. “As far as we can tell, this is equally important, if not more important.”

Should I begin wearing a hospital-grade mask indoors? And how long is too long to stay indoors?

Health care workers may all need to wear N95 masks, which filter out most aerosols. At the moment, they are advised to do so only when engaged in certain medical procedures that are thought to produce aerosols.

For the rest of us, cloth face masks will still greatly reduce risk, as long as most people wear them. At home, when you’re with your own family or with roommates you know to be careful, masks are still not necessary. But it is a good idea to wear them in other indoor spaces, experts said.

As for how long is safe, that is frustratingly tough to answer. A lot depends on whether the room is too crowded to allow for a safe distance from others and whether there is fresh air circulating through the room.

What does airborne transmission mean for reopening schools and colleges?

This is a matter of intense debate. Many schools are poorly ventilated and are too poorly funded to invest in new filtration systems. “There is a huge vulnerability to infection transmission via aerosols in schools,” said Don Milton, an aerosol expert at the University of Maryland.

Most children younger than 12 seem to have only mild symptoms, if any, so elementary schools may get by. “So far, we don’t have evidence that elementary schools will be a problem, but the upper grades, I think, would be more likely to be a problem,” Milton said.

College dorms and classrooms are also cause for concern.

Milton said the government should think of long-term solutions for these problems. Having public schools closed “clogs up the whole economy, and it’s a major vulnerability,” he said.

“Until we understand how this is part of our national defense, and fund it appropriately, we’re going to remain extremely vulnerable to these kinds of biological threats.”

What are some things I can do to minimize the risks?

Do as much as you can outdoors. Despite the many photos of people at beaches, even a somewhat crowded beach, especially on a breezy day, is likely to be safer than a pub or an indoor restaurant with recycled air.

But even outdoors, wear a mask if you are likely to be close to others for an extended period.

When indoors, one simple thing people can do is to “open their windows and doors whenever possible,” Marr said. You can also upgrade the filters in your home air-conditioning systems, or adjust the settings to use more outdoor air rather than recirculated air.

Public buildings and businesses may want to invest in air purifiers and ultraviolet lights that can kill the virus. Despite their reputation, elevators may not be a big risk, Milton said, compared with public bathrooms or offices with stagnant air where you may spend a long time.

If none of those things are possible, try to minimize the time you spend in an indoor space, especially without a mask. The longer you spend inside, the greater the dose of virus you might inhale.

London, Feb 14: Liquor tycoon Vijay Mallya once again asked the Indian banks to take back 100 per cent of the principal amount owed to them at the end of his three-day British High Court appeal on Thursday against an extradition order to India.

The 64-year-old former Kingfisher Airlines boss, wanted in India on charges of fraud and money laundering amounting to an alleged Rs 9,000 crores in unpaid bank loans, said the Enforcement Directorate (ED) and the Central Bureau of Investigation (CBI) are fighting over the same assets and not treating him reasonably in the process.

“I request the banks with folded hands, take 100 per cent of your principal back, immediately,” he said outside the Royal Courts of Justice in London.

“The Enforcement Directorate attached the assets on the complaint by the banks that I was not paying them. I have not committed any offenses under the PMLA (Prevention of Money Laundering Act) that the Enforcement Directorate should suo moto attach my assets," he said.

"I am saying, please banks take your money. The ED is saying no, we have a claim over these assets. So, the ED on the one side and the banks on the other are fighting over the same assets,” he added.

Asked about heading back to India, he noted: “I should be where my family is, where my interests are.

"If the CBI and the ED are going to be reasonable, it’s a different story. What all they are doing to me for the last four years is totally unreasonable.”

Lord Justice Stephen Irwin and Justice Elisabeth Laing, the two-member bench presiding over the appeal, concluded hearing the arguments in the case and said they will be handing down their verdict at a later date after considering the oral as well as written submissions in the “very dense” case over the next few weeks.

On a day of heated arguments between Mallya’s barrister, Clare Montgomery, and Crown Prosecution Service (CPS) counsel Mark Summers, arguing on behalf of the Indian government, both sides clashed over the prima facie case of fraud and deception against Mallya.

“We submit that he lied to get the loans, then did something with the money he wasn’t supposed to and then refused to give back the money. All this could be perceived by a jury as patently dishonest conduct,” said Summers.

“What they [Kingfisher Airlines] were saying [to the banks] about profitability going forward was knowingly wrong,” he said, as he took the High Court through evidence to counter Mallya’s lawyers’ claims that Westminster Magistrates Court Judge Emma Arbuthnot had fallen into error when she found a case to answer in the Indian courts against Mallya.

Mallya, who remains on bail on an extradition warrant, is not required to attend the hearings but has been in court to observe the proceedings since the three-day appeal opened on Tuesday. A key defence to disprove a prima facie case of fraud and misrepresentation on his part has revolved around the fact that Kingfisher Airlines was the victim of economic misfortune alongside other Indian airlines.

However, the CPS has argued that “there is enough in the 32,000 pages of overall evidence to fulfil the [extradition] treaty obligations that there is a case to answer”. “There is not just a prima facie case but overwhelming evidence of dishonesty… and given the volume and depth of evidence the District Judge [Arbuthnot] had before her, the judgment is comprehensive and detailed with the odd error but nothing that impacts the prima facie case,” said Summers.

At the start of the appeal, Mallya’s counsel claimed Arbuthnot did not look at all of the evidence because if she had, she would not have fallen into the multiple errors that permeate her judgment. The High Court must establish if the magistrates’ court had in fact fallen short on a point of law in its verdict in favour of extradition.

Representatives from the Enforcement Directorate (ED) and Central Bureau of Investigation (CBI), as well as the Indian High Commission in London, have been present in court to take notes during the course of the appeal hearing.

Mallya had received permission to appeal against his extradition order signed off by former UK home secretary Sajid Javid last February only on one ground, which challenges the Indian government's prima facie case against him of fraudulent intentions in acquiring bank loans.

At the end of a year-long extradition trial at Westminster Magistrates’ Court in London in December 2018, Judge Arbuthnot had found “clear evidence of dispersal and misapplication of the loan funds” and accepted a prima facie case of fraud and a conspiracy to launder money against Mallya, as presented by the CPS on behalf of the Indian government.

Mallya remains on bail since his arrest on an extradition warrant in April 2017 involving a bond worth 650,000 pounds and other restrictions on his travel while he contests that ruling.